어획시기에 따른 남극 크릴(Euphausia superba)의 식품성분 변화

Abstract

Antarctic krill (Euphausia superba) is usually harvested in months between March and August. The variations in its nutritional compositions according to the month of harvest were investigated. Fresh-frozen krill was freeze-dried and milled. Moisture content were highest (80.7%) in June and lowest (77.7%) in March. Ash content were highest (13.5%) in March and lowest (12.4%) in July. Protein content were highest (74.1%) in June and lowest (48.0%) in May. Fat content were highest (23.7%) in April and lowest (17.8%) in June. Among total amino acids (9,292.86-11,055.91 mg/100 g), glutamic acid, aspartic acid and leucine showed high level in March and lowest level in June. Arginine showed the highest level in May and lowest level in July. Among free amino acids (761.25-1,363.14 mg/100 g), proline showed high level in March and low level in July. Taurine showed high level in August and low level in May. Polyunsaturated fatty acid (PUFA; EPA, DHA) was highest in March and occupied about 50% of total fatty acid composition. Oil-soluble vitamin A and E were highest in March and water-soluble vitamin content was less than that of oil-soluble vitamin. Mineral contents were highest (298.16 mg/100 g) in June and the highest mineral was Na of 235.60 mg/100 g. Heavy metal contents were highest (3.66 mg/ 100 g) in March and lowest (0.72 mg/ 100 g) in August. Nucleotides was highest (8,299 μmol/100 g) in July. Betaines were highest (7.291 mg/100 g) in April and lowest (5,472 mg/100 g) in June. Astaxanthin was highest (21.59 ppm) in May. Cholesterol was highest (367.20 mg/100 g) in April and lowest (249.65 mg/100 g) in March. Fluoride was highest (599.63 ppm) in August and lowest (397.51 ppm) in May.